'Bonomini" rosette for WC is the key element to connect the outlet of WC with the flexible & extensible pipe.This rosette is made from PP(polypropilen)for a good resistance to chemical attack and excellent insulating properties,avoiding any type of discharghe and possible leak of bed smell.The internal diameter is 11 cm and the external one is 17 cm.''Bonomini" rosette for WC can be quickly connect and has an easy installation system